Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/kernel/ptrace.c |
| 3 | * |
| 4 | * By Ross Biro 1/23/92 |
| 5 | * edited by Linus Torvalds |
| 6 | * ARM modifications Copyright (C) 2000 Russell King |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/mm.h> |
Paul Gortmaker | ce8b9d2 | 2011-07-18 12:03:53 -0400 | [diff] [blame] | 15 | #include <linux/elf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/ptrace.h> |
| 18 | #include <linux/user.h> |
| 19 | #include <linux/security.h> |
| 20 | #include <linux/init.h> |
Jesper Juhl | 7ed20e1 | 2005-05-01 08:59:14 -0700 | [diff] [blame] | 21 | #include <linux/signal.h> |
Russell King | 33fa9b1 | 2008-09-06 11:35:55 +0100 | [diff] [blame] | 22 | #include <linux/uaccess.h> |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 23 | #include <linux/perf_event.h> |
| 24 | #include <linux/hw_breakpoint.h> |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 25 | #include <linux/regset.h> |
Eric Paris | 5180bb3 | 2012-02-21 11:26:55 -0500 | [diff] [blame] | 26 | #include <linux/audit.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <asm/pgtable.h> |
| 29 | #include <asm/system.h> |
| 30 | #include <asm/traps.h> |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define REG_PC 15 |
| 33 | #define REG_PSR 16 |
| 34 | /* |
| 35 | * does not yet catch signals sent when the child dies. |
| 36 | * in exit.c or in signal.c. |
| 37 | */ |
| 38 | |
| 39 | #if 0 |
| 40 | /* |
| 41 | * Breakpoint SWI instruction: SWI &9F0001 |
| 42 | */ |
| 43 | #define BREAKINST_ARM 0xef9f0001 |
| 44 | #define BREAKINST_THUMB 0xdf00 /* fill this in later */ |
| 45 | #else |
| 46 | /* |
| 47 | * New breakpoints - use an undefined instruction. The ARM architecture |
| 48 | * reference manual guarantees that the following instruction space |
| 49 | * will produce an undefined instruction exception on all CPUs: |
| 50 | * |
| 51 | * ARM: xxxx 0111 1111 xxxx xxxx xxxx 1111 xxxx |
| 52 | * Thumb: 1101 1110 xxxx xxxx |
| 53 | */ |
| 54 | #define BREAKINST_ARM 0xe7f001f0 |
| 55 | #define BREAKINST_THUMB 0xde01 |
| 56 | #endif |
| 57 | |
Will Deacon | e513f8b | 2010-06-25 12:24:53 +0100 | [diff] [blame] | 58 | struct pt_regs_offset { |
| 59 | const char *name; |
| 60 | int offset; |
| 61 | }; |
| 62 | |
| 63 | #define REG_OFFSET_NAME(r) \ |
| 64 | {.name = #r, .offset = offsetof(struct pt_regs, ARM_##r)} |
| 65 | #define REG_OFFSET_END {.name = NULL, .offset = 0} |
| 66 | |
| 67 | static const struct pt_regs_offset regoffset_table[] = { |
| 68 | REG_OFFSET_NAME(r0), |
| 69 | REG_OFFSET_NAME(r1), |
| 70 | REG_OFFSET_NAME(r2), |
| 71 | REG_OFFSET_NAME(r3), |
| 72 | REG_OFFSET_NAME(r4), |
| 73 | REG_OFFSET_NAME(r5), |
| 74 | REG_OFFSET_NAME(r6), |
| 75 | REG_OFFSET_NAME(r7), |
| 76 | REG_OFFSET_NAME(r8), |
| 77 | REG_OFFSET_NAME(r9), |
| 78 | REG_OFFSET_NAME(r10), |
| 79 | REG_OFFSET_NAME(fp), |
| 80 | REG_OFFSET_NAME(ip), |
| 81 | REG_OFFSET_NAME(sp), |
| 82 | REG_OFFSET_NAME(lr), |
| 83 | REG_OFFSET_NAME(pc), |
| 84 | REG_OFFSET_NAME(cpsr), |
| 85 | REG_OFFSET_NAME(ORIG_r0), |
| 86 | REG_OFFSET_END, |
| 87 | }; |
| 88 | |
| 89 | /** |
| 90 | * regs_query_register_offset() - query register offset from its name |
| 91 | * @name: the name of a register |
| 92 | * |
| 93 | * regs_query_register_offset() returns the offset of a register in struct |
| 94 | * pt_regs from its name. If the name is invalid, this returns -EINVAL; |
| 95 | */ |
| 96 | int regs_query_register_offset(const char *name) |
| 97 | { |
| 98 | const struct pt_regs_offset *roff; |
| 99 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 100 | if (!strcmp(roff->name, name)) |
| 101 | return roff->offset; |
| 102 | return -EINVAL; |
| 103 | } |
| 104 | |
| 105 | /** |
| 106 | * regs_query_register_name() - query register name from its offset |
| 107 | * @offset: the offset of a register in struct pt_regs. |
| 108 | * |
| 109 | * regs_query_register_name() returns the name of a register from its |
| 110 | * offset in struct pt_regs. If the @offset is invalid, this returns NULL; |
| 111 | */ |
| 112 | const char *regs_query_register_name(unsigned int offset) |
| 113 | { |
| 114 | const struct pt_regs_offset *roff; |
| 115 | for (roff = regoffset_table; roff->name != NULL; roff++) |
| 116 | if (roff->offset == offset) |
| 117 | return roff->name; |
| 118 | return NULL; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * regs_within_kernel_stack() - check the address in the stack |
| 123 | * @regs: pt_regs which contains kernel stack pointer. |
| 124 | * @addr: address which is checked. |
| 125 | * |
| 126 | * regs_within_kernel_stack() checks @addr is within the kernel stack page(s). |
| 127 | * If @addr is within the kernel stack, it returns true. If not, returns false. |
| 128 | */ |
| 129 | bool regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr) |
| 130 | { |
| 131 | return ((addr & ~(THREAD_SIZE - 1)) == |
| 132 | (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1))); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * regs_get_kernel_stack_nth() - get Nth entry of the stack |
| 137 | * @regs: pt_regs which contains kernel stack pointer. |
| 138 | * @n: stack entry number. |
| 139 | * |
| 140 | * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which |
| 141 | * is specified by @regs. If the @n th entry is NOT in the kernel stack, |
| 142 | * this returns 0. |
| 143 | */ |
| 144 | unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n) |
| 145 | { |
| 146 | unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs); |
| 147 | addr += n; |
| 148 | if (regs_within_kernel_stack(regs, (unsigned long)addr)) |
| 149 | return *addr; |
| 150 | else |
| 151 | return 0; |
| 152 | } |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * this routine will get a word off of the processes privileged stack. |
| 156 | * the offset is how far from the base addr as stored in the THREAD. |
| 157 | * this routine assumes that all the privileged stacks are in our |
| 158 | * data space. |
| 159 | */ |
| 160 | static inline long get_user_reg(struct task_struct *task, int offset) |
| 161 | { |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 162 | return task_pt_regs(task)->uregs[offset]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | /* |
| 166 | * this routine will put a word on the processes privileged stack. |
| 167 | * the offset is how far from the base addr as stored in the THREAD. |
| 168 | * this routine assumes that all the privileged stacks are in our |
| 169 | * data space. |
| 170 | */ |
| 171 | static inline int |
| 172 | put_user_reg(struct task_struct *task, int offset, long data) |
| 173 | { |
Al Viro | 815d5ec | 2006-01-12 01:05:57 -0800 | [diff] [blame] | 174 | struct pt_regs newregs, *regs = task_pt_regs(task); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | int ret = -EINVAL; |
| 176 | |
| 177 | newregs = *regs; |
| 178 | newregs.uregs[offset] = data; |
| 179 | |
| 180 | if (valid_user_regs(&newregs)) { |
| 181 | regs->uregs[offset] = data; |
| 182 | ret = 0; |
| 183 | } |
| 184 | |
| 185 | return ret; |
| 186 | } |
| 187 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | /* |
| 189 | * Called by kernel/ptrace.c when detaching.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | */ |
| 191 | void ptrace_disable(struct task_struct *child) |
| 192 | { |
Will Deacon | 425fc47 | 2011-02-14 14:31:09 +0100 | [diff] [blame] | 193 | /* Nothing to do. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | /* |
| 197 | * Handle hitting a breakpoint. |
| 198 | */ |
| 199 | void ptrace_break(struct task_struct *tsk, struct pt_regs *regs) |
| 200 | { |
| 201 | siginfo_t info; |
| 202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | info.si_signo = SIGTRAP; |
| 204 | info.si_errno = 0; |
| 205 | info.si_code = TRAP_BRKPT; |
| 206 | info.si_addr = (void __user *)instruction_pointer(regs); |
| 207 | |
| 208 | force_sig_info(SIGTRAP, &info, tsk); |
| 209 | } |
| 210 | |
| 211 | static int break_trap(struct pt_regs *regs, unsigned int instr) |
| 212 | { |
| 213 | ptrace_break(current, regs); |
| 214 | return 0; |
| 215 | } |
| 216 | |
| 217 | static struct undef_hook arm_break_hook = { |
| 218 | .instr_mask = 0x0fffffff, |
| 219 | .instr_val = 0x07f001f0, |
| 220 | .cpsr_mask = PSR_T_BIT, |
| 221 | .cpsr_val = 0, |
| 222 | .fn = break_trap, |
| 223 | }; |
| 224 | |
| 225 | static struct undef_hook thumb_break_hook = { |
| 226 | .instr_mask = 0xffff, |
| 227 | .instr_val = 0xde01, |
| 228 | .cpsr_mask = PSR_T_BIT, |
| 229 | .cpsr_val = PSR_T_BIT, |
| 230 | .fn = break_trap, |
| 231 | }; |
| 232 | |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 233 | static struct undef_hook thumb2_break_hook = { |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 234 | .instr_mask = 0xffffffff, |
| 235 | .instr_val = 0xf7f0a000, |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 236 | .cpsr_mask = PSR_T_BIT, |
| 237 | .cpsr_val = PSR_T_BIT, |
Jon Medhurst | 592201a | 2011-03-26 19:19:07 +0000 | [diff] [blame] | 238 | .fn = break_trap, |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 239 | }; |
| 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | static int __init ptrace_break_init(void) |
| 242 | { |
| 243 | register_undef_hook(&arm_break_hook); |
| 244 | register_undef_hook(&thumb_break_hook); |
Daniel Jacobowitz | d23bc1b | 2010-02-02 18:22:16 +0100 | [diff] [blame] | 245 | register_undef_hook(&thumb2_break_hook); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | core_initcall(ptrace_break_init); |
| 250 | |
| 251 | /* |
| 252 | * Read the word at offset "off" into the "struct user". We |
| 253 | * actually access the pt_regs stored on the kernel stack. |
| 254 | */ |
| 255 | static int ptrace_read_user(struct task_struct *tsk, unsigned long off, |
| 256 | unsigned long __user *ret) |
| 257 | { |
| 258 | unsigned long tmp; |
| 259 | |
| 260 | if (off & 3 || off >= sizeof(struct user)) |
| 261 | return -EIO; |
| 262 | |
| 263 | tmp = 0; |
Paul Brook | 68b7f715 | 2009-07-24 12:34:58 +0100 | [diff] [blame] | 264 | if (off == PT_TEXT_ADDR) |
| 265 | tmp = tsk->mm->start_code; |
| 266 | else if (off == PT_DATA_ADDR) |
| 267 | tmp = tsk->mm->start_data; |
| 268 | else if (off == PT_TEXT_END_ADDR) |
| 269 | tmp = tsk->mm->end_code; |
| 270 | else if (off < sizeof(struct pt_regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | tmp = get_user_reg(tsk, off >> 2); |
| 272 | |
| 273 | return put_user(tmp, ret); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Write the word at offset "off" into "struct user". We |
| 278 | * actually access the pt_regs stored on the kernel stack. |
| 279 | */ |
| 280 | static int ptrace_write_user(struct task_struct *tsk, unsigned long off, |
| 281 | unsigned long val) |
| 282 | { |
| 283 | if (off & 3 || off >= sizeof(struct user)) |
| 284 | return -EIO; |
| 285 | |
| 286 | if (off >= sizeof(struct pt_regs)) |
| 287 | return 0; |
| 288 | |
| 289 | return put_user_reg(tsk, off >> 2, val); |
| 290 | } |
| 291 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | #ifdef CONFIG_IWMMXT |
| 293 | |
| 294 | /* |
| 295 | * Get the child iWMMXt state. |
| 296 | */ |
| 297 | static int ptrace_getwmmxregs(struct task_struct *tsk, void __user *ufp) |
| 298 | { |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 299 | struct thread_info *thread = task_thread_info(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
| 302 | return -ENODATA; |
| 303 | iwmmxt_task_disable(thread); /* force it to ram */ |
Russell King | cdaabbd | 2006-03-12 22:36:06 +0000 | [diff] [blame] | 304 | return copy_to_user(ufp, &thread->fpstate.iwmmxt, IWMMXT_SIZE) |
| 305 | ? -EFAULT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Set the child iWMMXt state. |
| 310 | */ |
| 311 | static int ptrace_setwmmxregs(struct task_struct *tsk, void __user *ufp) |
| 312 | { |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 313 | struct thread_info *thread = task_thread_info(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | if (!test_ti_thread_flag(thread, TIF_USING_IWMMXT)) |
| 316 | return -EACCES; |
| 317 | iwmmxt_task_release(thread); /* force a reload */ |
Russell King | 17320a9 | 2006-03-15 14:57:13 +0000 | [diff] [blame] | 318 | return copy_from_user(&thread->fpstate.iwmmxt, ufp, IWMMXT_SIZE) |
Russell King | cdaabbd | 2006-03-12 22:36:06 +0000 | [diff] [blame] | 319 | ? -EFAULT : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
| 321 | |
| 322 | #endif |
| 323 | |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 324 | #ifdef CONFIG_CRUNCH |
| 325 | /* |
| 326 | * Get the child Crunch state. |
| 327 | */ |
| 328 | static int ptrace_getcrunchregs(struct task_struct *tsk, void __user *ufp) |
| 329 | { |
| 330 | struct thread_info *thread = task_thread_info(tsk); |
| 331 | |
| 332 | crunch_task_disable(thread); /* force it to ram */ |
| 333 | return copy_to_user(ufp, &thread->crunchstate, CRUNCH_SIZE) |
| 334 | ? -EFAULT : 0; |
| 335 | } |
| 336 | |
| 337 | /* |
| 338 | * Set the child Crunch state. |
| 339 | */ |
| 340 | static int ptrace_setcrunchregs(struct task_struct *tsk, void __user *ufp) |
| 341 | { |
| 342 | struct thread_info *thread = task_thread_info(tsk); |
| 343 | |
| 344 | crunch_task_release(thread); /* force a reload */ |
| 345 | return copy_from_user(&thread->crunchstate, ufp, CRUNCH_SIZE) |
| 346 | ? -EFAULT : 0; |
| 347 | } |
| 348 | #endif |
| 349 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 350 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 351 | /* |
| 352 | * Convert a virtual register number into an index for a thread_info |
| 353 | * breakpoint array. Breakpoints are identified using positive numbers |
| 354 | * whilst watchpoints are negative. The registers are laid out as pairs |
| 355 | * of (address, control), each pair mapping to a unique hw_breakpoint struct. |
| 356 | * Register 0 is reserved for describing resource information. |
| 357 | */ |
| 358 | static int ptrace_hbp_num_to_idx(long num) |
| 359 | { |
| 360 | if (num < 0) |
| 361 | num = (ARM_MAX_BRP << 1) - num; |
| 362 | return (num - 1) >> 1; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Returns the virtual register number for the address of the |
| 367 | * breakpoint at index idx. |
| 368 | */ |
| 369 | static long ptrace_hbp_idx_to_num(int idx) |
| 370 | { |
| 371 | long mid = ARM_MAX_BRP << 1; |
| 372 | long num = (idx << 1) + 1; |
| 373 | return num > mid ? mid - num : num; |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Handle hitting a HW-breakpoint. |
| 378 | */ |
Peter Zijlstra | a8b0ca1 | 2011-06-27 14:41:57 +0200 | [diff] [blame] | 379 | static void ptrace_hbptriggered(struct perf_event *bp, |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 380 | struct perf_sample_data *data, |
| 381 | struct pt_regs *regs) |
| 382 | { |
| 383 | struct arch_hw_breakpoint *bkpt = counter_arch_bp(bp); |
| 384 | long num; |
| 385 | int i; |
| 386 | siginfo_t info; |
| 387 | |
| 388 | for (i = 0; i < ARM_MAX_HBP_SLOTS; ++i) |
| 389 | if (current->thread.debug.hbp[i] == bp) |
| 390 | break; |
| 391 | |
| 392 | num = (i == ARM_MAX_HBP_SLOTS) ? 0 : ptrace_hbp_idx_to_num(i); |
| 393 | |
| 394 | info.si_signo = SIGTRAP; |
| 395 | info.si_errno = (int)num; |
| 396 | info.si_code = TRAP_HWBKPT; |
| 397 | info.si_addr = (void __user *)(bkpt->trigger); |
| 398 | |
| 399 | force_sig_info(SIGTRAP, &info, current); |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Set ptrace breakpoint pointers to zero for this task. |
| 404 | * This is required in order to prevent child processes from unregistering |
| 405 | * breakpoints held by their parent. |
| 406 | */ |
| 407 | void clear_ptrace_hw_breakpoint(struct task_struct *tsk) |
| 408 | { |
| 409 | memset(tsk->thread.debug.hbp, 0, sizeof(tsk->thread.debug.hbp)); |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Unregister breakpoints from this task and reset the pointers in |
| 414 | * the thread_struct. |
| 415 | */ |
| 416 | void flush_ptrace_hw_breakpoint(struct task_struct *tsk) |
| 417 | { |
| 418 | int i; |
| 419 | struct thread_struct *t = &tsk->thread; |
| 420 | |
| 421 | for (i = 0; i < ARM_MAX_HBP_SLOTS; i++) { |
| 422 | if (t->debug.hbp[i]) { |
| 423 | unregister_hw_breakpoint(t->debug.hbp[i]); |
| 424 | t->debug.hbp[i] = NULL; |
| 425 | } |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | static u32 ptrace_get_hbp_resource_info(void) |
| 430 | { |
| 431 | u8 num_brps, num_wrps, debug_arch, wp_len; |
| 432 | u32 reg = 0; |
| 433 | |
| 434 | num_brps = hw_breakpoint_slots(TYPE_INST); |
| 435 | num_wrps = hw_breakpoint_slots(TYPE_DATA); |
| 436 | debug_arch = arch_get_debug_arch(); |
| 437 | wp_len = arch_get_max_wp_len(); |
| 438 | |
| 439 | reg |= debug_arch; |
| 440 | reg <<= 8; |
| 441 | reg |= wp_len; |
| 442 | reg <<= 8; |
| 443 | reg |= num_wrps; |
| 444 | reg <<= 8; |
| 445 | reg |= num_brps; |
| 446 | |
| 447 | return reg; |
| 448 | } |
| 449 | |
| 450 | static struct perf_event *ptrace_hbp_create(struct task_struct *tsk, int type) |
| 451 | { |
| 452 | struct perf_event_attr attr; |
| 453 | |
| 454 | ptrace_breakpoint_init(&attr); |
| 455 | |
| 456 | /* Initialise fields to sane defaults. */ |
| 457 | attr.bp_addr = 0; |
| 458 | attr.bp_len = HW_BREAKPOINT_LEN_4; |
| 459 | attr.bp_type = type; |
| 460 | attr.disabled = 1; |
| 461 | |
Avi Kivity | 4dc0da8 | 2011-06-29 18:42:35 +0300 | [diff] [blame] | 462 | return register_user_hw_breakpoint(&attr, ptrace_hbptriggered, NULL, |
| 463 | tsk); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | static int ptrace_gethbpregs(struct task_struct *tsk, long num, |
| 467 | unsigned long __user *data) |
| 468 | { |
| 469 | u32 reg; |
| 470 | int idx, ret = 0; |
| 471 | struct perf_event *bp; |
| 472 | struct arch_hw_breakpoint_ctrl arch_ctrl; |
| 473 | |
| 474 | if (num == 0) { |
| 475 | reg = ptrace_get_hbp_resource_info(); |
| 476 | } else { |
| 477 | idx = ptrace_hbp_num_to_idx(num); |
| 478 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { |
| 479 | ret = -EINVAL; |
| 480 | goto out; |
| 481 | } |
| 482 | |
| 483 | bp = tsk->thread.debug.hbp[idx]; |
| 484 | if (!bp) { |
| 485 | reg = 0; |
| 486 | goto put; |
| 487 | } |
| 488 | |
| 489 | arch_ctrl = counter_arch_bp(bp)->ctrl; |
| 490 | |
| 491 | /* |
| 492 | * Fix up the len because we may have adjusted it |
| 493 | * to compensate for an unaligned address. |
| 494 | */ |
| 495 | while (!(arch_ctrl.len & 0x1)) |
| 496 | arch_ctrl.len >>= 1; |
| 497 | |
Will Deacon | ba55d3d | 2011-02-25 20:19:32 +0100 | [diff] [blame] | 498 | if (num & 0x1) |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 499 | reg = bp->attr.bp_addr; |
Will Deacon | ba55d3d | 2011-02-25 20:19:32 +0100 | [diff] [blame] | 500 | else |
| 501 | reg = encode_ctrl_reg(arch_ctrl); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 502 | } |
| 503 | |
| 504 | put: |
| 505 | if (put_user(reg, data)) |
| 506 | ret = -EFAULT; |
| 507 | |
| 508 | out: |
| 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | static int ptrace_sethbpregs(struct task_struct *tsk, long num, |
| 513 | unsigned long __user *data) |
| 514 | { |
| 515 | int idx, gen_len, gen_type, implied_type, ret = 0; |
| 516 | u32 user_val; |
| 517 | struct perf_event *bp; |
| 518 | struct arch_hw_breakpoint_ctrl ctrl; |
| 519 | struct perf_event_attr attr; |
| 520 | |
| 521 | if (num == 0) |
| 522 | goto out; |
| 523 | else if (num < 0) |
| 524 | implied_type = HW_BREAKPOINT_RW; |
| 525 | else |
| 526 | implied_type = HW_BREAKPOINT_X; |
| 527 | |
| 528 | idx = ptrace_hbp_num_to_idx(num); |
| 529 | if (idx < 0 || idx >= ARM_MAX_HBP_SLOTS) { |
| 530 | ret = -EINVAL; |
| 531 | goto out; |
| 532 | } |
| 533 | |
| 534 | if (get_user(user_val, data)) { |
| 535 | ret = -EFAULT; |
| 536 | goto out; |
| 537 | } |
| 538 | |
| 539 | bp = tsk->thread.debug.hbp[idx]; |
| 540 | if (!bp) { |
| 541 | bp = ptrace_hbp_create(tsk, implied_type); |
| 542 | if (IS_ERR(bp)) { |
| 543 | ret = PTR_ERR(bp); |
| 544 | goto out; |
| 545 | } |
| 546 | tsk->thread.debug.hbp[idx] = bp; |
| 547 | } |
| 548 | |
| 549 | attr = bp->attr; |
| 550 | |
| 551 | if (num & 0x1) { |
| 552 | /* Address */ |
| 553 | attr.bp_addr = user_val; |
| 554 | } else { |
| 555 | /* Control */ |
| 556 | decode_ctrl_reg(user_val, &ctrl); |
| 557 | ret = arch_bp_generic_fields(ctrl, &gen_len, &gen_type); |
| 558 | if (ret) |
| 559 | goto out; |
| 560 | |
| 561 | if ((gen_type & implied_type) != gen_type) { |
Will Deacon | ce9b1b0 | 2010-11-25 12:59:31 +0000 | [diff] [blame] | 562 | ret = -EINVAL; |
| 563 | goto out; |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | attr.bp_len = gen_len; |
| 567 | attr.bp_type = gen_type; |
| 568 | attr.disabled = !ctrl.enabled; |
| 569 | } |
| 570 | |
| 571 | ret = modify_user_hw_breakpoint(bp, &attr); |
| 572 | out: |
| 573 | return ret; |
| 574 | } |
| 575 | #endif |
| 576 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 577 | /* regset get/set implementations */ |
| 578 | |
| 579 | static int gpr_get(struct task_struct *target, |
| 580 | const struct user_regset *regset, |
| 581 | unsigned int pos, unsigned int count, |
| 582 | void *kbuf, void __user *ubuf) |
| 583 | { |
| 584 | struct pt_regs *regs = task_pt_regs(target); |
| 585 | |
| 586 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 587 | regs, |
| 588 | 0, sizeof(*regs)); |
| 589 | } |
| 590 | |
| 591 | static int gpr_set(struct task_struct *target, |
| 592 | const struct user_regset *regset, |
| 593 | unsigned int pos, unsigned int count, |
| 594 | const void *kbuf, const void __user *ubuf) |
| 595 | { |
| 596 | int ret; |
| 597 | struct pt_regs newregs; |
| 598 | |
| 599 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 600 | &newregs, |
| 601 | 0, sizeof(newregs)); |
| 602 | if (ret) |
| 603 | return ret; |
| 604 | |
| 605 | if (!valid_user_regs(&newregs)) |
| 606 | return -EINVAL; |
| 607 | |
| 608 | *task_pt_regs(target) = newregs; |
| 609 | return 0; |
| 610 | } |
| 611 | |
| 612 | static int fpa_get(struct task_struct *target, |
| 613 | const struct user_regset *regset, |
| 614 | unsigned int pos, unsigned int count, |
| 615 | void *kbuf, void __user *ubuf) |
| 616 | { |
| 617 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 618 | &task_thread_info(target)->fpstate, |
| 619 | 0, sizeof(struct user_fp)); |
| 620 | } |
| 621 | |
| 622 | static int fpa_set(struct task_struct *target, |
| 623 | const struct user_regset *regset, |
| 624 | unsigned int pos, unsigned int count, |
| 625 | const void *kbuf, const void __user *ubuf) |
| 626 | { |
| 627 | struct thread_info *thread = task_thread_info(target); |
| 628 | |
| 629 | thread->used_cp[1] = thread->used_cp[2] = 1; |
| 630 | |
| 631 | return user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 632 | &thread->fpstate, |
| 633 | 0, sizeof(struct user_fp)); |
| 634 | } |
| 635 | |
| 636 | #ifdef CONFIG_VFP |
| 637 | /* |
| 638 | * VFP register get/set implementations. |
| 639 | * |
| 640 | * With respect to the kernel, struct user_fp is divided into three chunks: |
| 641 | * 16 or 32 real VFP registers (d0-d15 or d0-31) |
| 642 | * These are transferred to/from the real registers in the task's |
| 643 | * vfp_hard_struct. The number of registers depends on the kernel |
| 644 | * configuration. |
| 645 | * |
| 646 | * 16 or 0 fake VFP registers (d16-d31 or empty) |
| 647 | * i.e., the user_vfp structure has space for 32 registers even if |
| 648 | * the kernel doesn't have them all. |
| 649 | * |
| 650 | * vfp_get() reads this chunk as zero where applicable |
| 651 | * vfp_set() ignores this chunk |
| 652 | * |
| 653 | * 1 word for the FPSCR |
| 654 | * |
| 655 | * The bounds-checking logic built into user_regset_copyout and friends |
| 656 | * means that we can make a simple sequence of calls to map the relevant data |
| 657 | * to/from the specified slice of the user regset structure. |
| 658 | */ |
| 659 | static int vfp_get(struct task_struct *target, |
| 660 | const struct user_regset *regset, |
| 661 | unsigned int pos, unsigned int count, |
| 662 | void *kbuf, void __user *ubuf) |
| 663 | { |
| 664 | int ret; |
| 665 | struct thread_info *thread = task_thread_info(target); |
| 666 | struct vfp_hard_struct const *vfp = &thread->vfpstate.hard; |
| 667 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); |
| 668 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); |
| 669 | |
| 670 | vfp_sync_hwstate(thread); |
| 671 | |
| 672 | ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 673 | &vfp->fpregs, |
| 674 | user_fpregs_offset, |
| 675 | user_fpregs_offset + sizeof(vfp->fpregs)); |
| 676 | if (ret) |
| 677 | return ret; |
| 678 | |
| 679 | ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf, |
| 680 | user_fpregs_offset + sizeof(vfp->fpregs), |
| 681 | user_fpscr_offset); |
| 682 | if (ret) |
| 683 | return ret; |
| 684 | |
| 685 | return user_regset_copyout(&pos, &count, &kbuf, &ubuf, |
| 686 | &vfp->fpscr, |
| 687 | user_fpscr_offset, |
| 688 | user_fpscr_offset + sizeof(vfp->fpscr)); |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * For vfp_set() a read-modify-write is done on the VFP registers, |
| 693 | * in order to avoid writing back a half-modified set of registers on |
| 694 | * failure. |
| 695 | */ |
| 696 | static int vfp_set(struct task_struct *target, |
| 697 | const struct user_regset *regset, |
| 698 | unsigned int pos, unsigned int count, |
| 699 | const void *kbuf, const void __user *ubuf) |
| 700 | { |
| 701 | int ret; |
| 702 | struct thread_info *thread = task_thread_info(target); |
Dave Martin | 247f499 | 2012-01-30 20:22:28 +0100 | [diff] [blame] | 703 | struct vfp_hard_struct new_vfp; |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 704 | const size_t user_fpregs_offset = offsetof(struct user_vfp, fpregs); |
| 705 | const size_t user_fpscr_offset = offsetof(struct user_vfp, fpscr); |
| 706 | |
Dave Martin | 247f499 | 2012-01-30 20:22:28 +0100 | [diff] [blame] | 707 | vfp_sync_hwstate(thread); |
| 708 | new_vfp = thread->vfpstate.hard; |
| 709 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 710 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 711 | &new_vfp.fpregs, |
| 712 | user_fpregs_offset, |
| 713 | user_fpregs_offset + sizeof(new_vfp.fpregs)); |
| 714 | if (ret) |
| 715 | return ret; |
| 716 | |
| 717 | ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf, |
| 718 | user_fpregs_offset + sizeof(new_vfp.fpregs), |
| 719 | user_fpscr_offset); |
| 720 | if (ret) |
| 721 | return ret; |
| 722 | |
| 723 | ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, |
| 724 | &new_vfp.fpscr, |
| 725 | user_fpscr_offset, |
| 726 | user_fpscr_offset + sizeof(new_vfp.fpscr)); |
| 727 | if (ret) |
| 728 | return ret; |
| 729 | |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 730 | vfp_flush_hwstate(thread); |
Will Deacon | 8130b9d | 2012-01-30 20:23:29 +0100 | [diff] [blame] | 731 | thread->vfpstate.hard = new_vfp; |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | #endif /* CONFIG_VFP */ |
| 736 | |
| 737 | enum arm_regset { |
| 738 | REGSET_GPR, |
| 739 | REGSET_FPR, |
| 740 | #ifdef CONFIG_VFP |
| 741 | REGSET_VFP, |
| 742 | #endif |
| 743 | }; |
| 744 | |
| 745 | static const struct user_regset arm_regsets[] = { |
| 746 | [REGSET_GPR] = { |
| 747 | .core_note_type = NT_PRSTATUS, |
| 748 | .n = ELF_NGREG, |
| 749 | .size = sizeof(u32), |
| 750 | .align = sizeof(u32), |
| 751 | .get = gpr_get, |
| 752 | .set = gpr_set |
| 753 | }, |
| 754 | [REGSET_FPR] = { |
| 755 | /* |
| 756 | * For the FPA regs in fpstate, the real fields are a mixture |
| 757 | * of sizes, so pretend that the registers are word-sized: |
| 758 | */ |
| 759 | .core_note_type = NT_PRFPREG, |
| 760 | .n = sizeof(struct user_fp) / sizeof(u32), |
| 761 | .size = sizeof(u32), |
| 762 | .align = sizeof(u32), |
| 763 | .get = fpa_get, |
| 764 | .set = fpa_set |
| 765 | }, |
| 766 | #ifdef CONFIG_VFP |
| 767 | [REGSET_VFP] = { |
| 768 | /* |
| 769 | * Pretend that the VFP regs are word-sized, since the FPSCR is |
| 770 | * a single word dangling at the end of struct user_vfp: |
| 771 | */ |
| 772 | .core_note_type = NT_ARM_VFP, |
| 773 | .n = ARM_VFPREGS_SIZE / sizeof(u32), |
| 774 | .size = sizeof(u32), |
| 775 | .align = sizeof(u32), |
| 776 | .get = vfp_get, |
| 777 | .set = vfp_set |
| 778 | }, |
| 779 | #endif /* CONFIG_VFP */ |
| 780 | }; |
| 781 | |
| 782 | static const struct user_regset_view user_arm_view = { |
| 783 | .name = "arm", .e_machine = ELF_ARCH, .ei_osabi = ELF_OSABI, |
| 784 | .regsets = arm_regsets, .n = ARRAY_SIZE(arm_regsets) |
| 785 | }; |
| 786 | |
| 787 | const struct user_regset_view *task_user_regset_view(struct task_struct *task) |
| 788 | { |
| 789 | return &user_arm_view; |
| 790 | } |
| 791 | |
Namhyung Kim | 9b05a69 | 2010-10-27 15:33:47 -0700 | [diff] [blame] | 792 | long arch_ptrace(struct task_struct *child, long request, |
| 793 | unsigned long addr, unsigned long data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | int ret; |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 796 | unsigned long __user *datap = (unsigned long __user *) data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | |
| 798 | switch (request) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | case PTRACE_PEEKUSR: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 800 | ret = ptrace_read_user(child, addr, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | break; |
| 802 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | case PTRACE_POKEUSR: |
| 804 | ret = ptrace_write_user(child, addr, data); |
| 805 | break; |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | case PTRACE_GETREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 808 | ret = copy_regset_to_user(child, |
| 809 | &user_arm_view, REGSET_GPR, |
| 810 | 0, sizeof(struct pt_regs), |
| 811 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | break; |
| 813 | |
| 814 | case PTRACE_SETREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 815 | ret = copy_regset_from_user(child, |
| 816 | &user_arm_view, REGSET_GPR, |
| 817 | 0, sizeof(struct pt_regs), |
| 818 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | break; |
| 820 | |
| 821 | case PTRACE_GETFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 822 | ret = copy_regset_to_user(child, |
| 823 | &user_arm_view, REGSET_FPR, |
| 824 | 0, sizeof(union fp_state), |
| 825 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | break; |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | case PTRACE_SETFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 829 | ret = copy_regset_from_user(child, |
| 830 | &user_arm_view, REGSET_FPR, |
| 831 | 0, sizeof(union fp_state), |
| 832 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | break; |
| 834 | |
| 835 | #ifdef CONFIG_IWMMXT |
| 836 | case PTRACE_GETWMMXREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 837 | ret = ptrace_getwmmxregs(child, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | break; |
| 839 | |
| 840 | case PTRACE_SETWMMXREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 841 | ret = ptrace_setwmmxregs(child, datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | break; |
| 843 | #endif |
| 844 | |
| 845 | case PTRACE_GET_THREAD_AREA: |
Al Viro | e7c1b32 | 2006-01-12 01:05:56 -0800 | [diff] [blame] | 846 | ret = put_user(task_thread_info(child)->tp_value, |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 847 | datap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | break; |
| 849 | |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 850 | case PTRACE_SET_SYSCALL: |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 851 | task_thread_info(child)->syscall = data; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 852 | ret = 0; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 853 | break; |
| 854 | |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 855 | #ifdef CONFIG_CRUNCH |
| 856 | case PTRACE_GETCRUNCHREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 857 | ret = ptrace_getcrunchregs(child, datap); |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 858 | break; |
| 859 | |
| 860 | case PTRACE_SETCRUNCHREGS: |
Namhyung Kim | b640a0d | 2010-10-27 15:33:48 -0700 | [diff] [blame] | 861 | ret = ptrace_setcrunchregs(child, datap); |
Lennert Buytenhek | 5429b06 | 2006-06-27 22:56:19 +0100 | [diff] [blame] | 862 | break; |
| 863 | #endif |
| 864 | |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 865 | #ifdef CONFIG_VFP |
| 866 | case PTRACE_GETVFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 867 | ret = copy_regset_to_user(child, |
| 868 | &user_arm_view, REGSET_VFP, |
| 869 | 0, ARM_VFPREGS_SIZE, |
| 870 | datap); |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 871 | break; |
| 872 | |
| 873 | case PTRACE_SETVFPREGS: |
Dave Martin | 5be6f62 | 2011-04-18 14:48:23 +0100 | [diff] [blame] | 874 | ret = copy_regset_from_user(child, |
| 875 | &user_arm_view, REGSET_VFP, |
| 876 | 0, ARM_VFPREGS_SIZE, |
| 877 | datap); |
Catalin Marinas | 3d1228e | 2009-02-11 13:12:56 +0100 | [diff] [blame] | 878 | break; |
| 879 | #endif |
| 880 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 881 | #ifdef CONFIG_HAVE_HW_BREAKPOINT |
| 882 | case PTRACE_GETHBPREGS: |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 883 | if (ptrace_get_breakpoints(child) < 0) |
| 884 | return -ESRCH; |
| 885 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 886 | ret = ptrace_gethbpregs(child, addr, |
| 887 | (unsigned long __user *)data); |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 888 | ptrace_put_breakpoints(child); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 889 | break; |
| 890 | case PTRACE_SETHBPREGS: |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 891 | if (ptrace_get_breakpoints(child) < 0) |
| 892 | return -ESRCH; |
| 893 | |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 894 | ret = ptrace_sethbpregs(child, addr, |
| 895 | (unsigned long __user *)data); |
Frederic Weisbecker | bf0b8f4 | 2011-04-08 17:29:36 +0200 | [diff] [blame] | 896 | ptrace_put_breakpoints(child); |
Will Deacon | 864232f | 2010-09-03 10:42:55 +0100 | [diff] [blame] | 897 | break; |
| 898 | #endif |
| 899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | default: |
| 901 | ret = ptrace_request(child, request, addr, data); |
| 902 | break; |
| 903 | } |
| 904 | |
| 905 | return ret; |
| 906 | } |
| 907 | |
Eric Paris | 5180bb3 | 2012-02-21 11:26:55 -0500 | [diff] [blame] | 908 | #ifdef __ARMEB__ |
| 909 | #define AUDIT_ARCH_NR AUDIT_ARCH_ARMEB |
| 910 | #else |
| 911 | #define AUDIT_ARCH_NR AUDIT_ARCH_ARM |
| 912 | #endif |
| 913 | |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 914 | asmlinkage int syscall_trace(int why, struct pt_regs *regs, int scno) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | { |
| 916 | unsigned long ip; |
| 917 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | /* |
| 919 | * Save IP. IP is used to denote syscall entry/exit: |
| 920 | * IP = 0 -> entry, = 1 -> exit |
| 921 | */ |
| 922 | ip = regs->ARM_ip; |
| 923 | regs->ARM_ip = why; |
| 924 | |
Nathaniel Husted | 29ef73b | 2012-01-03 14:23:09 -0500 | [diff] [blame] | 925 | if (!ip) |
| 926 | audit_syscall_exit(regs); |
| 927 | else |
Eric Paris | 5180bb3 | 2012-02-21 11:26:55 -0500 | [diff] [blame] | 928 | audit_syscall_entry(AUDIT_ARCH_NR, scno, regs->ARM_r0, |
Nathaniel Husted | 29ef73b | 2012-01-03 14:23:09 -0500 | [diff] [blame] | 929 | regs->ARM_r1, regs->ARM_r2, regs->ARM_r3); |
| 930 | |
| 931 | if (!test_thread_flag(TIF_SYSCALL_TRACE)) |
| 932 | return scno; |
| 933 | if (!(current->ptrace & PT_PTRACED)) |
| 934 | return scno; |
| 935 | |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 936 | current_thread_info()->syscall = scno; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | /* the 0x80 provides a way for the tracing parent to distinguish |
| 939 | between a syscall stop and SIGTRAP delivery */ |
| 940 | ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) |
| 941 | ? 0x80 : 0)); |
| 942 | /* |
| 943 | * this isn't the same as continuing with a signal, but it will do |
| 944 | * for normal use. strace only continues with a signal if the |
| 945 | * stopping signal is not SIGTRAP. -brl |
| 946 | */ |
| 947 | if (current->exit_code) { |
| 948 | send_sig(current->exit_code, current, 1); |
| 949 | current->exit_code = 0; |
| 950 | } |
| 951 | regs->ARM_ip = ip; |
Nicolas Pitre | 3f47112 | 2006-01-14 19:30:04 +0000 | [diff] [blame] | 952 | |
Russell King | 5ba6d3f | 2007-05-06 13:56:26 +0100 | [diff] [blame] | 953 | return current_thread_info()->syscall; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | } |